ls on grub rescue - unknown filesystem [duplicate]
The "normal" ls that you are doing is running against the crash recovery pseudo-disk stored in initramfs*. The initramfs contains only enough tools to fix the system.
You may find this how to mess with grub rescue article helpful, particularly section "17 Grub Rescue Image".
Does adding a slash:
grub rescue > ls (hd0,1)/
work?